宽带激光熔覆梯度生物活性陶瓷复合涂层组织与性能

为了增加基材与生物陶瓷涂层之间的结合强度,消除激光熔覆过程中基材与生物陶瓷涂层之间的开裂倾向,设计了一种梯度生物陶瓷复合涂层并采用宽带激光熔覆技术在Ti-6Al-4V合金上制备了梯度生物陶瓷复合涂层,对其组织和性能进行了研究.结果表明:钙和氧元素主要分布在生物陶瓷涂层中;钛和钒元素主要分布在基材和合金化层内;磷元素分布在合金层与陶瓷层中.合金层中基底组织上分布着白色共晶组织和白色颗粒,基底组织主要为Ti(Al,P,Fe,V)相,白色共晶组织主要为Fe2Ti4O AlV3,白色颗粒为结晶析出的Al3V0.333Ti0.666;生物陶瓷层中的基底组织为胞状晶,其上分布有灰色相和白色颗粒相,胞状晶主要为GaO、CaTiO3和HA,灰色相为β-TCP及Ca2Ti2O6,白色颗粒相为TiO2.陶瓷涂层表面形成了类珊瑚礁结构及短杆堆积结构.这种表面结构将有助于为骨细胞长入生物陶瓷涂层提供通道.陶瓷层与钛合金基体之间的结合强度大于37.3 MPa.合金层的最高硬度为1600 HV0.2,生物陶瓷涂层显微硬度最大值约为1300HV0.2.

Microstructure and Properties on Gradient Bioceremics Composite Coating Produced by Wide -band Laser Cladding on Surface of Ti Alloy

To increase bonding strength between bioceramic coating and substrate and eliminate thermal cracks during laser cladding, a kind of gradient bioceramics coating is designed. And the gradient bioceramic composite coating on surface of Ti alloy was prepared by using wide-band laser cladding technique. Its microstructure and microhardness was studied. The experimental results indicated that Calcium and Oxygen mainly distribute in the bioceramic; Titanium and Vanadium mainly distribute in the substrate and alloying layer; Fe distributes in alloying layer. P mainly exists in the bioceramic coating. The matrix phase in the alloying layer is Ti(Al,P,Fe,V)and the white eutectic structure in the alloying layer is mainly comprised of Fe_2Ti_4O+AlV_3, and the white particle phase is Al_3V_ 0.333Ti_ 0.666;The matrix phase in bioceramics coating consists of CaO,CaTiO_3 and Hydroxyapatite, and the pale particle phase in bioceramics coating is mainly comprised of β-TCP and Ca_2Ti_2O_6 , and white particle phase in biocera